vampire!Superman where he can't come inside without permission..
lex rides superman for hours, coming over and over on his cock. lex's advanced healing results in not having a refractory period.
being overstimulated and crying from overwhelming (why isnt anyone ever just whelmed? /ref /quote) pleasure and pain from being on the edge the whole time.
swelling so full inside lex from needing to come for hours that not even his advanced healing can keep him loose enough around superman. getting even tighter the longer they go and making even more of a mess.















