Im currently on the abi room, but the body options syas that something is missing, how do i resolve that?
You first need to complete the cow path with Abi, and then spend your points at the end of your playthrough to unlock the milk pump.
COW PATH
To do so, agree to help Abi with the formula, then fail to figure it out before running out of tries.
Then make sure to use the pump to supply Abi's requests.
Then once you finish your game, spend your points on the pump.
Then get to where you're at now in the game, the Ally path, and then you'll be able to give her the pump and her body mod options will be available.