I think Ibusuki doesn't understand Tarou at all.
"He will get used to it".
Yeah, right... going on dates with Ebino, all lovey dovey, with a sleeping Eve at their side.
Tarou isn't that thick skinned and it would only make him (them) suffer.
The way I see it, the only way this is going to be solved in a good way is by Tarou really falling in love with Ibusuki while knowing she's a girl. It'll trigger a fusion of Ibusuki and Eve. So she will get the boobs she wished for, their love will be fulfilled and even if they still see FLZs, it won't matter.
This way of torturing Ebino is nasty.