Paying My Debt Off

5 months ago i borrowed money of my brother in law without my husband knowing,my brother in law and i have always got on great,I would often get flirty with him and knew he would give me the money, because he's kept it secret ive flirted with him even more and he gave it back starting with the odd comment that he knew my pussy is bald,I got really embarrassed that he knew,he told me that he likes them like that,he made comments about me be short 4'10 my small tits and i had a nice looking ass,I was shocked ive never heard him speak like that before,I didn't think about when i could pay him back then last month he called me when i just left work and asked me to meet him,it was a quiet spot i park up next to him i get out and he starts talking about me paying him back,I told him i couldn't yet and he said we can come to an arrangement i asked what it was and then he said i can do sexual favours to pay it back and no one would ever no,I was trying to process what he just said and got distracted when he pulled out his cock and leaned back against his car with it hanging out, he's a huge guy looks like a bodybuilder and his cock is massive to it scared the crap out of me,he said come and wank me off start you off with easy,I agreed and stood next to him holding what i would say was like a horse's cock,he tells me to go slow so i did for around 5 minutes then he gets me to kneel Infront of him and i started giving him a blowjob,I had to keep stopping my jaw was hurting from trying to fit it in,he takes my hand and helps me up and helped me out of my work dress and asks me to take my underwear off,I asked him what now and he smiled and tells me he's going to fuck me like ive never been fucked before,I was scared because his size i knew it was going to stretch my pussy,I get in the back of his car and he's behind me teasing my now wet pussy by rubbing his cock up and down,he then put the head in and i brace myself as he pushing the whole thing in,I tell him to go easy and then he thrusted hard making sure,I yelled out in pain as he picked up the pace ,he's telling me i had a tight c**t as he was pounding away,he was hitting the right spot and i screamed at him not to stop i was about to orgasm,I was screaming my head off at him to fuck me harder and at that moment i had my orgasm and collapsed on my stomach and then he had is, getting out my legs we're like jelly i was so weak and had his spunk running down my leg, before i drove off he told me tomorrow your ass is getting it so in the morning lube it up and get that hole ready, that next morning when my husband left i did just that even tried stretching it using a cucumber just so it's prepared for his big one,he did go easy at first then like the day before he faster,I buried my face in to the covers to stop the neighbors hearing me screaming and the best thing i heard him say was he's going to cum,I felt my ass filling up fast i didn't think he was going to stop, soon as he did i had to run to the toilet and empty it,my ass was sore for days, at least twice a week i let him fuck me.