Used by 4 guys in there 20s

my grandson caught me having sex with 2 guys when my wife was out with her sister i must have left the front door unlocked he walked into the house and heard me upstairs and he walked up and the bedroom door was open i did not hear him come up at the time i was been spit roasted he videos it on is phone then he must have left with out me knowing 2 days later i gets a call from him telling me he videos me having sex with 2 men and he sent me the video to prove it i could not be leave it i said please don't till your dad or grandma he said i want something from you to keep quiet i said how much do you want he said he did not want money he said he showed the video to his mates and they said they would like to fuck me and i want to watch them doing it i said when do you want this to happen he said the weekend when grandma is away on the Saturday morning . he said you will be blindfold i said if i agree to this you must delete the video and not tell any one he said ok.
Saturday morning come and my grandson arrived with 4 other guys all in there young 20s 2 where black and they said they wanted to fuck a old white guy so i got undressed and they put the blindfold on me and bent me over the bed and i felt this cock slide in me and then another one slid is cock in my mouth and i heard my grandson say go on ride my granddad and after what seemed a long time they both cum one in my mouth and the other in my ass and i new the was 2 more guys to fuck me and i felt this what seemed a massive thing enter me as it entered me i was in pain i said please stop then my grandson said no carry on it was one of the black guys he had a 11in cock i was glad when he shot is load up me and i new i still had another guy to go my hole was sore then i felt another cock enter me it was not as big as the last one but he still fucked me for ages after he cum in me i thought great its over then i head a guy say its my turn again now i said no more please and my grandson said yes go on i said please make this the last i can not take any more when he cum they stood me up which then i feel to my knees the grandson toke the blindfold off me and the 4 guys said that was a good fuck your granddad can take cock then they left and i had a shower to clean my self up