Grandson Masturbating

My grandson was masturbating over a dirty magazine on my bed I had a word with him not to be ashamed pleasuring himself as i flicked through the pages i noticed all the women we're 50 and older so i asked him do you like older women and his dick was starting to get hard again he wasn't fully erect just yet not until i mentioned those women are my age and bang he was fully erect I asked him a cheeky question does he get excited by me and his dick started to twitch that gave me my answer and i gave him a choice if it was me or the magazine what one would he pick and right away he said you nan I knew he wasn't going to say a word to anyone now and i closed the magazine and said to him it's his lucky day i unzipped my knee length skirt and took off my blouse and faced my 15 year old grandson and unclipped my bra and let my huge tits out and then let him masturbate and he unleashed a mother load of cum over my tits I was rubbing it all in and even licked my fingers to taste his cum he stepped forward i wasn't sure what he was about to do and before he could do anything i sucked his dick and he bucked I could hear him mumble oh fuck tasting his cum was yummy and his dick was still solid I asked him what now and he pointed to my knickers and said he wanted them off i knew why but i wanted to hear it from him want your pussy nan I ended up completely naked and he stuck his hand between my legs and fingering my wet pussy i just couldn't take it anymore i shoved him back on to my bed and mounted him I guided his dick into me and started fucking him forget him being my grandson i had a teenage lad underneath me I could tell it was his first time and didn't take long for him to cum again and fuck me didn't he it seemed like he wasn't going to stop once he was spent i rolled off laying next to him for a few minutes trying to gather my thoughts and he shot up got himself between my legs and didn't say a word he got on me and began fucking me his face to the side of me all i could hear was him grunting not sure how long it went on for but when he did finally cum i was done my bed had so much cum on it I'm going to find it hard to keep up with him if it's going to be like that all the time