Meeting boyfriends dad for the first time

So I'm 15, and my boyfriends dad has asked my boyfriend if I want to stop for a weekend sometime (his parents are divorced n he doesn't live his dad) and I'm all up for it but I'm scared to ask my parents.

I know I will be sharing a bed with my boyfriend and we do have sex, quite a lot 😬, but my parents obviously don't know but his dad knows it and I'm scared to ask my parents if I can stop for the weekend because I don't know if they'd want me to share a bed with him.

I can only think of more pros than cons for lying about where I am, I'd just tell them that I'm at my friends house all weekend.

Does anyone know what I should do? 😕