I'd say it's normal lol at least with me, I mean my ex never could make me cum with her hand or mouth, of course she was inexpierenced so I think that may have had something to do with it, it always made her extreamly depressed though , which put preassure on me to cum , which of course has only the opposite effect lol

Really though I wouldn't worry about it to much, if it feels good just enjoy it , theres no need to rush to cum , just enjoy the time ^__^ just be sure she gets alot of attention herself lol, go 69's lmao woot woot