Two young couples of friends become swingers

Two young couples who for several years have been beautifully and wonderfully friendly with each other still decided to take this desperate step - to become swingers, and what to do, sex with a second half has long become boring for these several years, but you need to somehow dilute the situation and try something new. So they decided to have hard sex with their girlfriends in the same room, and then, after warming up, also exchange partners to finish what they started.