For some reason, when i submit to the Lizardman in the Swamp, the meter end up going down instead of up when it comes to how much he like/hate you, that might be a bug here that can be fix at any time when you want to.
No probably, and the swamp creature does the same thing as well when i submit to him/it, not sure if you are going to add pregnancy in the game in the future, but if you do, maybe there can be a special recipe or event that allow the male player character to craft a potion that give it a mpreg effect, it can only be used once if you don't want it to be used on the male animal NPC chaarcters, i love the scenes from the ruin adventure i did and maybe the sex scenes from those lizards as well if i can get them to work, i love feral animals the most, with anthro ones being the second favorite.