Easy to see the Kira/Robin "throuple" working and the threesome with Lexi/Holly. Thought there might have been a Linda/Cece threesome/throuple at some point.
Kira-Robin is obvious, since they were already in a relationship
and looking to add a guy (provided they both felt good about him). Lexi-Holly is a little less certain, since
they had only kissed before and, with the threesome in Ch5, they have only slept together once and while Lexi was drunk. However, they clearly love each other deeply as friends, so there's at least a possibility. Still, Holly and (especially) Lexi
both have doubts about their ability to keep a relationship or to find real love, so it's a little uncertain if they can overcome that obstacle, although doing so together I think drastically improves their chances.
I don't see a Linda-Cece thing working out TBH. They are really good friends, but I didn't get the feeling that Linda was the sharing type. For instance, when the MC had been with Stephanie, Linda completely stepped aside, rather than ever floating the idea of a threesome to her or the MC. Also, given Cece's self-esteem / depression problems, I'm not sure she'd be OK with the MC splitting time with another woman. I wouldn't expect
any LI to be OK with their lover having multiple partners unless they were decently secure in themselves. (It's partly why I think a Lexi-Holly thruple is less certain.) While I think Linda and Cece are both great, I definitely don't think Cece would qualify, and I have my doubts about Linda.