Imagine Lyra and Bon Bon taking turns riding you for the entire night as Lyra's magic makes your refractory period a non-issue. Lyra's thrusts are wild and mindless, meant to fuck you silly and destroy anything in your mind aside from marepussy. Bon Bon's thrusts are slower, but when she's sliding down, she moves faster and presses her earth pony plot on you with pressure, meant to constantly remind you of your position as their pet. Eventually, your pelvis would get shattered by weight of the couple as one is riding another's tail as the former fucks you, but that's even better for them to make you unable to escape, to make you even more dependable on them, catering to their maternal instincts before they spend an another night draining you, giggling in enjoyment of you squirm underneath them, howling and squealing in pain and pleasure as they keep riding you to get themselves pregnant with long yearned foals, unable to get them as a married dyke couple until they a human cock in their lives.