On her back, on the bed!

After a few moments, Rias dropped her harem panties and loincloth, straightening up, now only clad in her jewelry and natural charm. "So, Master... How do you want me?" she asked him, giving him a sultry wink.

He only needed to consider it for a second. "Lay back on the bed, and spread your legs. I want to look into your eyes as we take each other's virginities," he replied. She immediately nodded.

"Of course, Master, however you like!" she chimed, practically throwing herself backward onto the bed and parting her thighs. Her glistening, smooth sex was put on display for him, the lips already twitching with need.

He stepped up to her, stroking his cock and guiding it right to her folds. "I wish I couldn't cum until you did," he said after a moment. Even if her pleasure mostly came from pleasing him now, his pride as a man and a pervert would not allow him to fail to satisfy a woman.

She nodded and immediately snapped her fingers. "Done, Master... Go ahead, put it in me!" she moaned. He wasted no time, thrusting right into her, and she crooned as her folds parted, letting his shaft invade her core.

Issei grunted, letting the sensations overtake him. This was amazing, and her pussy walls were practically milking his shaft! It was almost like she had a second mouth down there, sucking his cock, but it was just her manipulating her nether walls with supernatural skill. "Oh... This is so good..." he panted, starting to fuck her, taking it slow at first.

Rias crooned, arching her back, and giggled in delight as Issei planted his hands on her boobs. "Mmmnh, yes, Master, touch me, use me, fuck me... I'm your slut, your ****!" she panted, wrapping her legs around his waist.

He slowly picked up speed, panting with every thrust, before he paused a bit, giving her breasts a light squeeze. "Wait, I don't need to worry about getting you pregnant or anything, do I?" he managed to ask. She quickly shook her head, urging him to continue, which he did as she explained.

"Unh, Master, genies don't get, mmmnh, pregnant unless their Master, ahn, wishes for it," she gasped out, tightening the embrace of her legs around his waist. "Oh yeah, right there..."

Issei nodded, smiling as he began to pound into her, having reached the precipice of his climax, but was now stuck there, due to his previous wish, and Rias's magic. He would not be able to go over that edge until he got Rias to that point, and he was now feverishly working to do that. "Ah... This is maddening, but good," he gasped out, his hips slapping against hers with each quick thrust.

"Oh yeah, Master, play with my titties~!" Rias grinned, pressing her boobs into his hands. He didn't need telling twice, giving her chest another squeeze, before tracing her nipples with his thumbs. "Yes, like that, Master!" she crooned. Then, she arched her back more forcefully as she cried out, her tongue lolling out, and her eyes rolling up, having reached her peak. "YES, FUUUUUUUCK!" she wailed.

Issei grunt and tightly shut his eyes as his manhood erupted, allowing his seed to gush right into her waiting depths. "Unh..." he panted, having finally gotten his release, collapsing atop her. "That... Was amazing..." he panted.