Happened when i was in my late 20's, i was spending holiday with my aunt. We have always been very close since small. She was living by herself after her divorce. It was the new year, it's was very quiet we were just chilling by the pool. I noticed that my aunts been working out and in tip top shape. I decided to be a bit flirty and commented on her body saying "You look stunning in that". She was in a 2 piece bikini. She commented back saying "I'm trying to say young" It was a slow day, my aunt suggested that i should join her for pilates. I've never done pilates so i've was a bit reluctant, but she managed to convince me by saying the women that come's there is stunning. I've alway been working out but that year , i was training for a fitness race so been in decent shape too. My aunt put on her sexy gym wear, was looking super hot in her Bodysuit and had a nice cleavage. I couldn't keep my eyes those melons. She notice i was staring at it and blushed. We drove to the class which was about 10 mins away, the sexual tension was rising between us, it was a hot day too. I could clearly see sweaty dripping down her neck and to her boobs which made it even more hot. We finally got the class , and i was pleasantly surprised by how good looking all the women were. Specially the instructor, she had a booty to kill for. The session was tough , really hard than what i thought. We were all drenched in sweat. End of the session my aunt introduced me to her mates, alot of her friends was about her age , they all were complimenting saying i did well. Classes ended and we both jumped in the car. It was too hot i decided to take my top off. My aunt commented saying "all my freind's were checking out this rig" Well like wise i saw all the guys checking you out ! We got home my aunt couldn't get the door open something was stuck. While i was trying to push the door i grinded my cock on her arse , she gasped and said "Not my little baby anymore" I knew this was the time to make a move. I leaned forward to kiss her . She held my face and said if you promise it's our secret and it's one time thing. I said then we better make it one to remember. pushed her to the couch and we locked lips and smooched. and kissed her neck , i could feel her sweat which made it even more hot. i pulled out boob out of her bodysuit and sucked it, she was moaning in pleasure , slowly she started dirty talking to me , and said i saw you checking out the women there , tell me who do you want to fuck. I was surprised .. I said the instructor , she slapped me and pulled my hair and said "My dirty baby" and pushed my face to her other boob. We had the time of our life's , it's one that i'll remember for the rest of my life.