Originally Posted by Arroccino
A Mod that allows you to romance the person you are playing with. Me and my bestie, and I know a few of my friends would really like a mod like that.
Where it has cutscenes like the ones you get with ShadowHeart, Astarion, Lae'zel, etc.
I think this would also be a lot of fun for couples who play BG3 together.

There is a mod that allows you to kiss other partymembers. The description says it should also work with other Tavs.
https://www.nexusmods.com/baldursgate3/mods/9344

If you want to go a bit further, (adult content)

you could try BG3SX (the sex framework) Don't know about multiplayer, but it lets you do the hanky panky with other partymembers but also any other NPC, e.g. Orin in the Bhaal temple.
https://www.nexusmods.com/baldursgate3/mods/6045

Only available on Nexus. Don't think this will ever be allowed on modio