Long time reader and first time poster for this thread (I think)
In high school/college I was in a relationship with this girl I went to high school with. One night I get home wasted and she comes over drunk as well. We start hooking up on the side of my house and she starts giving me an old fashioned. Bored, drunk, and starting to get a hurt penis from incorrect handling, I calmly said, "It's easier if you put your mouth on it." With little hesitation she starts going down on me. This being her first time, I was kind of blown away at how willing she was. Time passes and she is blowing me on my back patio in the middle of the night. I start getting bored AGAIN because she is awful at this as well. In result, I rub one out and she rubs my back. Looking back now it is really weird that it resulted in this but oh well.
Fast forward a few years and I have still not gotten a successful BJ. After seeing several other girls through out the years, many have claimed they're, "..really good at giving head." All of which were failures.. till recently. I started seeing this girl I met through a friend. We hook up twice and I got freaked out when she went down on me. Close to explosion and nervous about ruining her sheets/reputation with me, I went to the bathroom. After explaining my history with BJs she understands and expresses sympathy for me being lets say.. genetically different. Progressively we start boning and mid-way through she says she has to stop because I'm hurting her.
she wont let you bust in her mouth? or are you worried that if you do, she'll get pissed?
my first girlfriend gave me my first BJ, and she was terrible at it. and made it clear before she even put her mouth on it that if i came in her mouth, shed kill me. and any time she would do it after that, id have to stop her after a few minutes because id feel bad for making her give me head while i wasnt getting any enjoyment from it.
the first time i got one from a different chick (who is my current girlfriend) i was like blown away. she could suck it so good my hands would start tingling. anyway, the first time she gave me head i stopped her right before i was going to cum and she kinda got bummed out. i told her that i didnt want to cum in her mouth (because from all my previous bj experience, this was a big no no) and she just said "why? you dont want to finish?" that was pretty much her giving me the go ahead to cum in her mouth, and it makes getting good head great head.
it just depends on the girl. most likely if shes down to suck dick, and shes good enough to get you off, then she probably wants you to get off. if you dont or try to hold it in, she might think shes not doing a good enough job and get upset. id just let her know when youre close, that way if she doesnt want you to bust in her mouth, she'll stop before its too late.