For a public trash party or someone's own private time with the Winter Soldier, they give him drugs that only work on his supersoldier metabolism which force his body into overdrive, producing enormous volumes of semen as he comes and comes, to the point that they practically have to milk it out of him and keep rehydrating him as the drug works its way out of his system. Or they put a catheter in his penis and pump fake cum into his bladder and train him to piss it out in short spurts to make it look real, or trigger his ejaculation reflexes with a well-placed stun baton. And somehow the Winter Soldier can tell that something's not right, that his body isn't supposed to do this and it bewilders and terrifies him as it seemingly just WON'T STOP and he's in agony the entire time from the pain and pressure and pleasure of it. Either way I just want the Winter Soldier ejaculating cupfuls or more of semen like a fountain and being literally drenched in his own jizz by the end of it all.