Two very brief, rare but memorable blowjobs from my ever-lovin' wife:
we were having sex in the morning and had been banging our way through several locations in the house (the kids were gone that weekend). On the way to steam up the shower, she dropped to her knees and started sucking me. She'd never done that before and hasn't done it since. Almost shot my load in her mouth...
Another time, we were in a small trailer at a campground. Thankfully, our kids were heavy sleepers, especially the one in the bunk above us. We started groping and smooching very quietly and all of a sudden, she went down on me. Our kids our with their grandparents this week. Dare I hope for some more oral?