if its causing redness and such a tiny dab of bitter apple or ACV should help deter the suckling and give them something they can suckle safely on (my 7 mth olf kitten is a suckler, even now, she wasnt force weaned, or bottle fed, or taken from mommy too early...shes just a suckler) and eh has a stuffed lion thats her "blankie" a little bitter apple to keep them form suckling on eachothers tender parts and a surrogate they can snuggle into and kneed and such should do the trick.
its comfort, just like a baby and its pacifier or a toddler and their blankie and under normal circumstances best left be, but it sounds like in this case theres some irritation going on from the behaviour and it can lead to health issues (ie chaffing and infection)
its comfort, just like a baby and its pacifier or a toddler and their blankie and under normal circumstances best left be, but it sounds like in this case theres some irritation going on from the behaviour and it can lead to health issues (ie chaffing and infection)