Friends Sister

sometimes I think back and jerk off to when my friends sister asked me if she could " see it " which then quickly turned into can I "touch it". I was 17 and she was 15 and both intrigued by one anothers physical form. The one night we broke into his dads booze and took a couple drinks of scotch (which is super gross) and things got a little frisky. My buddy went down stairs to go find a couple of CD's to keep the music going. Almost immediately after he left the room she jumped over the couch I was looked me dead in the eyes and asked me if she could see my cock. I was kinda shocked but wasn't going to say no so I just pulled the waist ban down till it popped out. Were both super red in the face but she seemed extremely happy but heard my buddy coming back and everything went back normal...for a bit. Time goes by and next I went down stairs to grab so different music and sure enough a couple minutes later his sister was there too. She walk up to me and whispered that she wanted to touch it. I then said I dunno what if we get caught she replied with ( we better make this quick then). She dropped to her knees and pulled my shorts down and started jeeking me off. She jerked and jerked and eventually put it in her mouth for a couple minutes and sucked like she wanted my cum so bad. As I was about to cum i pulled my cock out of her mouth and blasted at least 6 to 7 ropes of cum on her face dripping onto her shirt. I said sorry fuck I didn't think it would be that much but she could care less in her words (its ok that was so fucking hot) I went upstairs with what I picked for more music and she cleaned up and went to change her shirt and didn't see her again for the rest of the night. After that night we regularly got together because she wanted to keep sucking my cock and I wasn't going to say no. She is married with kids as am I and we still see each other at partys and gatherings with friends and family. I catch her once and a while giving me the look and don't get me wrong I would love for my cock to be her mouth again but just can't at this stage in life.