.. I was just... scratching myself." I said, looking at the ground and feeling as weak as my excuse must have sounded. "I"m so sorry I.. I saw you..."...I stopped, feeling mute."You saw me naked?" She said. Her delicate finger trailed the line of her cleavage, which bulged as she squished her tits together with her elbows. "You weren"t scratching yourself, you were jacking off, son." She said, looking down at the again growing tent at my crotch. "Jacking off to Granny"s big bosoms, werent you?". I wanted her to touch me.I found her right hand and guided it down to my erect manhood. As soon as she felt it, she jerked her hand away, and then turned over so her back was to me. She was in the fetal position. I curled up against her back, I kissed her neck. She just laid there. I now made sure my hard cock was pressed aganst her silk covered ass. "What's the matter?" I whispered.She said nothing. I kissed her again on her neck and rubbed my stiff erection against her ass. She still stayed. She must have felt my thobs, because I started to feel her pussy contract around me, massaging me though we both lay still, locked in ecstacy. Her contractions grew stronger. ‘Feel good?’ I couldn’t respond, and just moaned. ‘I thought so.’ Her contractions increased in intensity until I became aware of her hips joining the dance. She locked her lips on mine now too, and began to thrust slowly and fluidly, moving me in and out of her sex in a delicious slow ballet. I joined her motion now,. Rosie then took a step back, I thought OK that's it time to go home.How wrong could I be. She just said, "Are you OK with this? I want another lesson but I also want you to make love to me, please be my first."I just nodded in disbelief, and she was on me like a shot, knocking me back on the bed and taking control of my semi erect cock.She started just giving me a good hard rub then she went to work with her mouth, doing everything my wife taught her.I somehow managed to get her in a sixty nine.