I was asked to be a unicorn but is this too much responsibility?

The married couple has 3 kids and they want to pay me to babysit. They want to take care of all the bills and take care of me and they want me to join. I only have 1 kid but I would have to be in charge of all the raising of kids while they work and they want to have sex with me. I also don’t like eating pussy that much I’m a pillow princess and I’m not a super freak. Unless I take about 3 shots. We have been friends for a while and she keeps asking us to come live with them. It feels like I would be stuck in the house all the time babysitting and then they want to have sex with me. Also they are older than me and not that attractive unless I took about 4 shots and I don’t want to become alcohol dependent. I’m half way in because I really don’t have anywhere to go or any family and they have been so kind to me. But I would have to get used to hooking up with them. It feel like some slave shit.