This is my technique for taking care of business without pressuring my girlfriend for sex when she most likely won't want it.
Sometimes, in the early morning as she is getting ready for work, I'll sneak into the bathroom while she's in the middle of her shower. Like all men, I usually wake up with an erection and knowing that she is naked in the other room really turns me on. I don't want to pressure her to have sex (especially if we have hit the snooze button a few times) so I grab the lotion and slowly start stroking the shaft of my penis. While doing this, sometimes she knows I'm in the bathroom and will ask what I'm up to. Other times, I can sneak up and pull back the shower curtain without her knowing. Those times are the best because I have a few seconds to look at her wet, glistening body as the warm water runs down her - in between her breasts, down the back of her hair, over her lovely shoulders.
I usually reach out to her and with my free hand I either grab a breast or put it on her hips to pull her close. Sometimes she resists a little but others she will be very receptive and will come right to me, placing her lips against mine as I stroke my cock. She likes to watch the faces I make when I come and, if I open my eyes during our kissing, I'll see that she is watching me - gauging how close to orgasm I am. As I approach orgasm, my breath gets short and I scrunch up my face. I can tell by her expression that she is getting turned on by this and her mouth opens just a bit in a small, dainty gasp. Letting go, I reach orgasm and squeeze her, letting her know that she has done a wonderful job helping me. Then, after kissing her deeply, I step into the shower with her to clean myself off and we usually hug each other for a minute or so before she steps out to dry herself off.