Am I (18M) infantilising my girlfriend’s (19F) agency in her desire to have some kinky birthday sex with me?

I really enjoyed writing that title. Anyway, I have a tiny quibble of a question but something that’s been on my mind recently.

It’s my birthday soon and my very amazing girlfriend wants to make it special (sexually and non sexually).

I believe that in her efforts to make the day special, and her belief that the day has to be sexually exciting for it to be the case, she might be under some ‘obligation’ or ‘duty’ sex. She’s mentioned on planning to do things she’s previously mentioned she’s uncomfortable with. That, as it’s my birthday, her mental framework shifts from ‘having fun’ to ‘making my boyfriend happy’. A sentiment that I appreciate, but I’d feel guilty in taking advantage of her.

Freedom with her body dictates that she should be able to freely give it for whatever reason, and that I’m being a little silly for overthinking things.

If I say no to this, I hurt her feelings and make her feel unwanted. If I say yes, I feel like I’m taking advantage of her. Am I infantilising her own agency and capacity to choose for herself?