Lilian helps out.

So far, Gary had been able to do everything that Lil had told him to do. He’d avoided having a shower with Bernie when she’d suggested it, saying he didn’t really feel like one that night. He’d also saved removing his T-shirt until after he’d turned the lights off in his bedroom and climbed into bed with his girlfriend to join her. In the dark, Gary was just starting to think he might just get away with it. He’d been a complete pile of nerves so far. One mistake and he was done; he’d be branded a cheater and his relationship with Bernie would be over.

In bed, in the dark, Bernie didn’t wait to get a hold of Gary and started kissing him, leadingly. Her hand slipped into Gary’s boxers and around his cock as he lifted up her own shirt and started to play with her tits. Gary was two fingers inside Bernie, bringing her on to an orgasm as she gave him a very fine hand job when they heard a knock at the door. They stopped what they were doing, hands still touching each other’s privates, when the door to Gary’s room opened and Lilian called out, “Can I join you guys?”

“Of course. Come in,” Bernie readily agreed, letting go of her vice-like grip on Gary’s cock as he pulled his greasy finger from where he’d bunched Bernie’s panties aside.

Gary had to straighten his hard-on inside his boxers as Lil crawled across the bed and found a spot for herself in between the two of them underneath the covers.

“Sorry if I interrupted anything. I just don’t want to be alone so soon after what happened with Steve,” Lilian gave the reason for her intrusion. In truth, it was part of her plan to help cover for her brother's infidelity.

“Oh no, we weren’t doing anything,” Bernie fibbed. “I was so mad when Gary told me what happened. What a complete scumbag he turned out to be.”

“Yes, he really is a cheating piece of shit,” Lilian agreed at the same time she reached behind herself to give her brother another punch in the guts for what he’d done to his own girlfriend today.

Gary ‘oof’ed in pain, but Bernice didn’t notice, too engrossed in Lilian’s ex-boyfriend dramas.

“You caught him in bed with someone you work with, didn’t you?” she asked.

“Yes, Colleen. I’d gone back into work late one shift and found the two of them in the middle of doing it on the prep bench out the back,” Lilian said.

“What did you do?”

“I threw a tray of Pannacottas at them!”

“Oh my God!” Bernie laughed. “What happened then?”

“Well, most of it hit the wall, but some of it landed on Colleen, dirty cheating slut. Steve kept trying to pull his pants up and tell me it wasn’t what it looked like. I said I can literally see your dick covered in her pussy juices.”

“Well, goodbye to bad dick,” Bernie declared.

“Mmmmmm,” Lil wavered.

“It wasn’t bad?” Bernie's voice took on a gossip-girl sort of tone.

“Not bad,” Lilian admitted. “Steve was pretty good with it. He’d always make me orgasm easily.”

“How big was it?”

“Seven. Seven and a half.”

“I’m right here, you two!” Gary cut in. “I don’t want to hear about the cock my little sister is getting.”

“Oh, be quiet. The girls are talking now,” Bernie playfully scolded him.

“He used to do this one thing that would make my toes curl.” Lilian started to story tell animatedly. “When I was on my back and he was on top of me, he’d hook my legs back with his elbows and slam down into me really deep and hard!”

“Oh, I love that!” Bernie agreed. “It’s called the Mating Press, I think.”

“Does Gary have any moves like that?” Lil asked.

“Well, there’s the Bouncing Spoons that I really like.”

“What’s that?”

“It’s kind of like reverse cowgirl, but Gary is sitting up instead of lying down, and you lean back against his chest as you ride.”

“Oh, that sounds really nice. Does he have good cock for it too?”

“Well, he’s not as big as Steve was, but he’s this nice curve to it that really hits my G-spot in some positions.”

“Oh, which ones?”

Gary had to lie there and listen as Bernice and Lilian spoke about his cock and their sex life in minute detail. Lil was on her side, facing away from him, and as she spoke and reenacted certain things, her bum would press back against his Johnson. He hadn’t tried to notice, but it was hard not to, that Lil was dressed only in a singlet and a pair of silk panties that were rubbing frequently up against his crotch. He’d been in the process of getting jerked off when Lilian had first come in, and the effects of that hadn’t really worn off. Gary's erection was returning in a strong way.

“Do you mind? All this talk has got me horny,” Bernice said to the brother and sister as the women had their sex chat.

Bernice’s mother, Joyce Bernstein, was the author of “Free to Masturbate” and had encouraged its teachings throughout Bernice’s life. It felt like nothing for her to pull her panties off and start to rub her fingers all along her oily lips and hard, throbbing clit.

Listening to his girlfriend masturbating was getting Gary even more turned on than he’d been before. Subconsciously, his hands came out and took a hold of Lil’s hips and instinctually guided them to an even better spot. Lil too accepted this change without challenge.

“You’re lucky, Bernie,” Lilian said. “Your mum is so open when it comes to sex, and you and Gary can fuck whenever you want. I won't be able to get that anymore.”

“Have you and Gary ever experimented?” Bernice asked. Her voice was becoming catchy as she was getting closer to making herself cum.

“No, never,” Lil said.

“You know, I think it’s completely normal for close family members to want to help each other out.” What did Bernice mean by that exactly? “If you wanted to borrow Gary, I wouldn’t object.”

As she said it, Lilian’s hand reached back between them and attached itself to Gary’s swollen flesh. He couldn’t help himself but moaned as his sister began to rub his aching hardness through his boxer briefs.

Gary had thought himself about to get a hand job from his sister just then when he felt Lilian lean in close to his ear and whisper quietly for just him, “Play along. Pretend.” Then for Bernice to hear. “Gary, please.”

His sister moaned in what sounded like honest desire as she started pulling her singlet off over her head before removing her panties also. Gary, who'd just been told to pretend, did likewise and got out of his own underwear and then moved over so he was on top of his sister. He couldn’t help that his cock was rigidly hard and stood straight out. As they came together, Lil caught it so that it didn’t go inside her, but tucked it up instead. It still ran along the top of her fanny, but at least it didn’t go inside.

Lilian started to move underneath Gary and moaned just as it would have sounded as if she was being entered by Gary's real cock. She was a very good actress. Enough that Bernice was convinced that Lil was getting fucked beside her, triggering the climax Bernice had been chasing. Hearing his girlfriend cumming beside them, Gary got in on the acting too and started to moan and pant softly as he rocked his hips. He was surprised when moisture started to flow almost immediately, and the underside of his cock became wet and coated with his sister's pussy.

The whole pantomime must have been what Lil had in mind, as while Bernice continued her orgasm, Lilian lifted her face to Gary’s chest and started to bite him in just the same way Laura had.

“Ahh!” Gary cried out in pain and pleasure as his sister covered up the damage his cheating had left that afternoon.

They continued until Bernice had shuddered her way through her entire blissful journey. Her return to them signalled as Gary felt Bernie start to rub lovingly on the side of his cheek. Bernice’s other hand found Lil’s nipple and pinched them teasingly.

Lilian moaned in response, and it sounded so real to Gary. Their dry humping was causing his hardness to constantly grind against Lil’s own clit, and despite only intending for it to be pretend, Lil’s body was starting to throb electrically.

“Give her the mating press,” Bernice encouraged Gary. “It’s her favourite.”

Underneath him, Lil signalled, “Ah ha,” and Gary lifted Lilian’s legs into place and trapped them in his elbows.

Her arse was lifted up off the bed, and pussy too. With the changed angle and being folded in half, Lilian couldn’t control their movements anymore, so that when Gary thrust the first time, it bounced across her hard nub as it was supposed to. Except when he pulled back and went for the second fake stroke, Gary’s greasy cockhead went straight up against Lil’s puffy pussy lips and continued deep inside.

“Ahhhhhhhhhh!” Lilian moaned as her brother cock sank to the very bottom of her pussy.

Bernice heard the cry and thought it was just Lilian enjoying her favourite position and not her brother’s cock filling her for the first time.

Gary gasped at the sudden feeling of hot, wet, tightness that consumed him.