There's a tag war going on on post #4475943. I've asked for advice multiple times on Discord and no one has particularly strong opinions on it except for Talulah, who is accusing me of tag vandalism on Discord and in forum #210515. I was advised to start a thread to settle it like adults and get input from those not on Discord.
My view is that there's no anatomically plausible explanation for what's happening there other than that there's a penis involved. The alternative, tribadism makes no sense to me unless their labia are literally glued together. Its tagged as tribadism on pixiv but I think that is irrelevant. That said, I can see how one would disagree.
@blindVigil as you're not on discord and you seem to strongly disagree, I would appreciate your input