Your girlfriend decides it'll be fun to do a threesome. You aren't that sure, but decide to give it try.

The stud she invited arrives, tall and muscled. You thought you'd take turns having your girlfriend, but, after ramming her for a while, he lays you on your belly. You say you're not sure you want this, but your girlfriend is delighted at the idea, so you end up submitting, if halfheartedly. After filling your tight (and aching) door with his seed, he picks her again, then you and so on till he's drained dry.

From his bag, he retrieves a chastity cage for you and a belt for her. At this point, you're in no position to argue, so you let him lock you both, thinking it's just for fun. Except he goes away, taking the keys, saying he'll be back in two days to unlock the chastities and start on you again.

 You've just become an owned couple.

A variation: you meet a couple and they invite you to their place for a threesome. You believe the guy will be sharing his gorgeous wife with you - and that's true - except he wants to enter you while you enter her. And he only tells you about this when you're really aroused by her caresses and the sight of her body. So you either give her up and go away or you agree to be deflowered by him.

It takes a while, but the couple talks you into accepting. Besides, at this point and horny as your are, you admit to yourself you need the experience. You may not enjoy it, but, at least, you'll leave with the memory of having done it.

After a while, there you are, emptying yourself inside her while he's grabbing you from behind, pounding and pounding. She extricates herself from under you and that leaves only you and him. You thought he'd be finished by now, but he keeps hammering, holding you tight so you're unable to escape. Eventually, he fills you with his seed and finally sets you free.

Later on, you go home, telling yourself you'll never do it again. Yet, deep down, you know you'll be anxiously waiting for them to summon you for another round. And you also know you'll obey.