I NEED ADVICE

ok this rarely happens but i need some help and idk who to even call about this so ill just post this and maybe someone will have an answer. so ill keep this short what do you do when one of your friends offers you some pussy? like this girl is legit just my friend and we were talking and we got on the topic of sex. she just outta nowhere is like i want some head from you -_____- like wtf i never thought that she looked at me that way cuz i am not the type shes usually with. i was literally speechless and that's a rarity. all i could say was *craigs gf in Friday voice* what you gonna give me. shes like oh you can get whatever you want and some other stuff my christian fingertips wont let me write. like what am i supposed to do? i do not believe in friends with benefits because it gets messy but like i know for a fact she knows what shes doing but i dont want things to get weird. like we are just friends and then this? i don't even know if she likes me in that way or shes just horny. heelllppp