Nope, Kenny joins you.

When you get downstairs, the twins have already departed for the backyard, leaving their dirty plates scattered everywhere. You shake your head and think, Typical. They're always leaving their shit lying around everywhere.

It's not until you've placed their dishes in the sink and given them a rinse that you stop and consider what you'd just thought. Lily and Violet hadn't existed as part of your family until yesterday, how exactly would you know what their typical behavior is? Before, you'd have to consciously consider the alterations you'd made for the knowledge to enter your brain. This thought came unbidden...but you know it to be true. There's lot of this whole Motherboard experience you still don't understand.

Kenny interrupts your thoughts, loudly stomping down the stairs. He's changed into his own swim trunks and looks much calmer than earlier. The time away from you probably helped that, but from his relaxed posture, you'd bet money that he rubbed one out while he was upstairs in his own room. Who exactly did he picture while jerking off?, you wonder.

"Come on," you say. "Let's not keep the girls waiting."

You push open the french doors that lead to the back patio, your brother following close behind. The girls have already set up four lounge chairs at the shallow end of the pool, claiming their own and leaving an empty chair between them and on the far side of Violet. As you and Kenny get closer, they stop talking abruptly, and Lily looks embarrassed. Both girls look down at your swim trunks, and you have a sneaking suspicion that they'd been continuing the conversation they'd started after you left the kitchen earlier. You allow your cock to harden slightly under their gaze, and their eyes widen slightly.

Nonchalantly, you take the seat between the topless twins, noting that their nipples have gotten thicker since you and Kenny joined them. They must have already applied their sunscreen, as their skin has a bright and slippery sheen to it. Your brother takes the far seat and places his hands over top of his lap. You can tell from his expression that he's already wondering why he agreed to join everyone.

Let's get the ball rolling, shall we?

"Hey girls, have I told you recently how phenomenal your tits are? I think you may have the best tits in the entire family. What do you think, Kenny?"

While the girls blush at your compliment, Kenny looks pained, but is finally able to manage, "Yeah, I agree. I wish my girlfriend had breasts as big as you guys."

"Oh, aren't you both just so sweet!" Lily declares. She licks her lips. "I don't think we could ask for two better, handsome brothers, could we Violet?" Violet wordlessly shakes her head. Her eyes have wandered back to Kenny, staring at him intently. He shifts uncomfortably under her gaze. You grin.

With as much drama as you can muster, you smack yourself in the forehead. "I'm such an idiot," you say. "We didn't bring out any sunscreen. Can we borrow yours so we don't get burned?" Lily nods and bends over to grab it, her boobs hanging like soft fruit. When she holds it out to you, you say, "Oh no. You should put it on me, Lily, and Violet can do Kenny."

The suggestion takes immediate hold and Lily squirts a sizable dollop into her hands before handing the tube over to Violet, who does the same. You lie back on the chair, your trunks tightening even further as Lily starts rubbing the cream into your lower legs, covering every bit of exposed skin with a healthy dose. For every second her hands are in contact with your body, you let your dick grow a little bit more, so that by the time she's made it to your thighs, the bulge is impossible to ignore and your sister doesn't even try. Her eyes drink it its monster size and you can tell it's having a lustful effect on her.

Meanwhile, Kenny is having a similar reaction to Violet's application of the sunscreen and, although he's not as large as you are, a giant tent has appeared in his swimsuit too. Violet's always been the shyer twin, however, and she's deliberately looking anywhere but where her brother's cock is pulsing beneath a thin layer of cloth.

Lily moves past your hidden monster and slips her hands along your well-defined six pack and pecs, the cool cream having no effect on the heat you feel from her touch. She lingers around your chest, and you can tell she's admiring your chiseled body. You've never had a girl look at you like this before, an obvious object of their desire and that, more than anything else turns you on even more. She leans forward to reach your shoulders and you can feel her hard nipples drag across you skin like match-heads striking a flame. The sensation causes your cock to twitch violently, shifting your swimsuit down and popping the tip free from its prison.

Lily stops when she realizes what has happened, and she looks down, hardly breathing as she inspects the fat, mushroom head. She sneaks a peak over at your brother and sister, but they haven't noticed.

They seem to have become entranced with their own actions. Violet is practically panting as she works the cream into Kenny's chest and you catch her subtly tweaking his nipples as she does. Kenny has his eyes firmly closed and his toes are scrunched up in a ball as he tries to maintain his composure, but it's getting harder and harder (as is the pole in his trunks!). Everybody's libido is increasing due to your presence.

Maybe that's why Lily whispers, "Well, if he's going to come out and play, he needs to be protected too, right?"

With the last of her sunscreen, your sister grabs your cock and spreads it on, stroking so far down that her hand disappears beneath the waistband of your swimsuit. Holy fuck, holy fuck, she's jerking me off!, you think wildly. But just as soon as she starts, she stops, pulling up your trunks so your member is hidden again. Your balls ache worst than they ever have before. She gives your dick an affectionate pat and then gives you a saucy little smile.

The sexy little minx knew exactly what she was doing to you! You grin back at her, but in your head, you think, Yeah, keep smiling. I'll be getting my **** soon enough.

Lily goes back to her chair and your brother and sister, distracted by the movement, look up in a daze, almost as if they don't realize where they are. Kenny recovers first and thanks Violet for helping, and your sister stumbles back to her own chair on unsteady legs. It seems like everyone enjoyed the experience immensely.

And you have no intention of letting up.