Suggestion: Increased impact for race name. If the spelling of the race name matches then some alternate conversation may be displayed and as a reaction to it and easier to be impregnated / get pregnant form the same species group without a fertility pill (with the pregnancy toggle enabled) ... mostly flavor text instead of a mechanical advantage if that makes more sense.
Particularly applicable for the furry toggle.
I'm not the best writer by any stretch do the following examples are placeholder quality at best to be perfectly honest.
Examples:
Succubus / Incubus - Rinny would be surprised to meet you as most of not all of that species is located in a single area and might call you brother or sister depending on if you chose to play with her tail before freeing her.
Bull/Cow - Bell will have a reaction of you haven to have small breasts when you meet her. Sammy will mention that you can get a breast pump from the nursery if the PC is lactating.
Cat - Option to talk down cassie by purring (higher chance of success). Gin / Wildcat may act more cat like during combat, sometimes choosing to purr (no damage) or attempt to stat licking the PC clean (50/50 chance of causing lust damage per turn). Linda and Kitty may state they are not scared of you so don't think about trying anything (Cat and mouse / rat interaction)
Deer - Fawn may occasional comment on the PC's appearance while blushing.
Shark - May call the PC seafood if any of the characters stats are below 10.
Wolf - Causes a staring contest which ends when cless gets a hold of themselves or the PC chooses to look away.
Fox - Miki & Sana are more playful in the approach to treating other foxes
Panda - Lin Lin knows the best way to massage your body so the speech bonus is doubled from 10% to 20%. for the rested bonus
Arlaune - Camilla will Ask if you know where to get more of the good plant food that you have been eating as you are surprisingly strong for not putting down roots. Able to flee from the 'invincible' plant boss at any point when the PC's health is over 0 with 100% success rate (partial immunity to the spores)
Fairy - The fairy blessing skill given by the fairy queen is 50% stronger (same species to more compatible with the skill.
Dog - Cless may wonder if the PC is as loyal as they appear to be.
Rabbit - May comment on how slow the PC is if nimble is below 20 and react with surprise if nimble is over 60.