The changes shes made to her body aren't things that he'll hate per say, it's just the manner in which she went about getting them that made him uncomfortable. He means what he said though, that it doesn't matter what her chassis is; at the end of the day she's still 2B and he still loves her no matter what.

He's so utterly overwhelmed by her, even more so when she leans in to kiss him and help him with his buttons. Dainty fingers are trembling, warmed by the feel of hers on his, and things are escalating before he registers her hands are under his black undershirt. It's so different, being touched by her compared to others, not just because of who she is but because of what she is. He can understand her in ways humans can't - the only one who could manage to is A2, for obvious reasons.

Before he knows it his shirt is gone, chest exposed and on display. Then she drops the compliment on him, the red on his face spreading down his neck all the way to his collarbone.

"C-Cute? R...Really?"

He looks like he's on the verge of a meltdown as he reaches up to slap his hands over his face out of embarrassment. He's going to die...but it'll be a good death. If 2B thinks he's cute...yeah, he's good with that.