Grandma is going to have fun with her grandson

I was at grandma's place. While I was doing my last homework before summer I could her grunts coming from living room. It was really hot to hear my grandma grunt as she works out.

I finished and peeked from grandma's room, she really is working out. I could see she had barbell on the floor and was doing push ups. How she is so good at it and she has been working out for 2 hours. Grandma got up looking real pumped wearing only her bikinies. To think that a woman in her 70s can be so big and so muscular. Grandma walked to me with smile on her face.

Grandma: "Now I think I am ready for the fun John"

Son: "Fun?"

Grandma got in the room.

Grandma: "You don't have girlfriend John?"

John: "No"

Grandma: "Well some woman has to take care of your needs if you know what I mean"

John: "Wait but you are my grandma..."

I felt my cock rising in my pants as I realized, grams wants her to be my first experience. She is right, I don't have a gf and I am indeed a virgin. She had already managed to make me cum in my pants during the show but this was for real. Grams might be in her 70s but she already outmuscles most guys with ease and clearly her new muscles have given her sexual energy back.

Grandma: "Looks like your cock is not minding it"

She sees that I am getting erect and is liking it. Something about my own grandma willingly wanting to do it with me is turning me on so much. Grams contrasting look is one huge turn on, she still looks like a sweet granny but has such big and ripped muscles. Just looking at grandma's meaty pecs is enough to turn me on.

Son: "Y-yeah...I would not mind doing it with you grams"

Grandma: "You are so sweet John, that's wonderful to hear. Before we get into the action, I bet you want to feel my muscles John"