So I don't know if there's already a suggestion for this but I couldn't find one so I thought I'd just go ahead and make one.

So essentially, when you have a request on a lioness up for reverse studding, you cannot use ANY items on her. This makes sense for applicators or certain breeding items, especially since most breeding items will be sent with the request.

However.

You cannot send fertility changing items with your heat request. Or at the very least you cannot send it with chasteberries, which makes trying to reverse stud to a low fertility lioness a complete hassle. It wouldn't be so bad if the owner of the lioness could just use some chasteberries on her instead, but as mentioned above you cannot use items until the requests are gone. So the owner or person requesting has to remove the request, then use the chasteberries, and then the person requesting has to go re-request.

All in all it's a mess and for a built in mechanic I'd think it would be a little bit easier if either you could send fertility items with the request (including multiple chasteberries) or if the owner could use fertility items on said lioness.