I think the best way is to have variations of threesomes (Lex and Ragnar, Ragnar and Citali, Lex and Citali). That way it can please the bara and yaoi crowd.
Personally I'd like a foursome route with all three tribesmen. Happy family route is the best! :D
Lol, I agree Lex's penis should be bigger! Big penis is not a problem for (experienced) gay men, so I think that can be a potential story idea for Lex having problem/complex with his penis size being too big.