At this point, no one who has had penetration with a 'named' character has been available for Tremolo to fuck.
Example - Heather fucked Tommy/Nick can only get BJ.
Becky fucked everyone can only get BJ
Sarah & Melanie have fucked people, but a name, place etc is never given.
Tara has a boyfriend and definitely fucked him, but it has never been stated.
Elena is probably going to break that streak. (And who knows where it goes from there). So fingers crossed.
Tiffani is the main one I want anyway, so she's still a possibility.
And of course, Lily was a virgin until she met Tremolo and has never had sex with anyone else.