You let him.

"oh fuck" you let out, feeling him brush his fingers against your (barely) thong clad pussy. They were soaking. With that he kisses you again, slower, more passionately. You can't hear the banging next door now, everything is drowned out in this moment. You kiss him back, moaning passionately. Now your tongues are wrestling, as you move onto his lap, grinding on his lap a little.

After a moment of being on top of him he grabs your ass and pulls you up to your feet with him, before pushing you against the wall next to Cat's room. Not that you cared at that point. You'd let him carry on if you were in the lounge right now, you don't know if you'd even stop if your boyfriend was here. Maybe he'd enjoy the show? He's now groping you through your shirt, pulling it down along with your bra, exposing your breasts. He moves his mouth down and takes a nipple in his mouth, twisting and pinching the other with his spare hand as he continues his massage of your panties.

"fuckkk yess James, like that" pornstars would envy how erotic you sound. You unzip your skirt and pull it off, leaving you in panties alone. Not for long. James rips them off! You gasp but before you can complain he has his fingers on your clit, rubbing you so close to orgasm. It doesn't take long.

"I'm gonna.. gonn.. fuckkkkk!" and with that, a massive tsunami wave of pleasure erupts from you as you cum on James' hand. You've just cheated on your boyfriend. What have you done? You look down and see that James has his cock in his hand. After a moment of shock, you realise that he is as big as he felt earlier, which turns you on all over again.