A while ago she found out I chatted up this girl that's a mutual acquaintance with her. She was very angry, but a couple days later I switched it around by saying I want us to have a threesome - at first she was disgusted, then during sex she suddenly loved this idea. Over time this evolved into something she brings up frequently without me even mentioning it.

Other girl is also med student, has a huge ass and overall very attractive. She talks about me with a number of her friends and I notice them watching me, her showing up near me "coincidentally", etc. Maybe worth mentioning, I've been soft nexting her lately because she's playing hard to get (for some reason wont show any IOIs and pretends she doesn't see me, only the moment we start talking she starts flirting) and her friends have been asking my LTR, who is officially just a plate, about our relationship status which caused annoying drama.

Just need a sanity check, would it be worth actually pursuing this other girl to have a threesome? I want it badly even if just for the insane reputation boost. On the other hand it would look very bad to my LTR I somehow get rejected. I've got a good hand currently, been nexting her which probably makes the hamster wheel go insane, maybe should just keep the reputation boost and not risk anything? Thoughts?

Attempt to answer own Q: find other woman to have threesome with. I want to do this, but tbh there aren't many prospects that I'd be into.