You feel something around the skin of your legs. You realize you are elsewhere entirely naked. The next feeling you perceive is that something is pulsating in your groin... and it is getting stronger. When you open your eyes, you see a man in front of you, hovering between your legs and stockings, pumping his dick into you.
You vew your already familar chest, but feel it swelling with each pump, obviously erecting your nipples. When you look around, you realize, you aren't at home anymore, and it is also not your body. Looks like your mother swapped you with another girl who wouldn't try to betray her. So mean! But now... get ready to get fucked.
Turns out your partner is a pretty nice dude, so at least some win in this situation, apart from sex.