Cucked by girlfriend PT.1 [MF]

Context- So my misses is this cute innocent looking busty 5ft nothing blonde, we have amazing sex but nothing out of the ordinary. I’ve always been into anal and eating ass and almost always eat her ass before sex which tends to give her crazy orgasms but never once been allowed to put it in her ass, which has never bothered me so much because I’ve always wanted her to enjoy it as much as me. I always try and bring up buttplugs with her as they are a massive turn on to me but she just laughs it off…

The last three months I’ve been obsessed with cuckold porn and whenever I’m having sex with her I can only cum when I’m getting head and visualising her getting fucked from behind by a BBC, it just does something for me the thought of her enjoying being so filled. I’d never once discussed this with her as I really couldn’t see her being into it one bit at all. Anyway about a month ago she’d pre-booked a hotel for a night in the city for the weekend just gone, which I thought was strange as she usually leaves it for me to sort out but didn’t think much more of the matter.