1 month post op breast aug, is there any harm to allowing my boyfriend to suck my nipple? (photo)

Generally, if your recovery has been uneventful it is unlikely there would be any harm from any sort of sexual activity at this point.

Truly, it is best to check with your surgeon and follow his/her recommendations and post-operative instructions. Assuming you do not have any incisions near the peri-areolar region and everything has healed well, I do not see a reason why your surgeon will not allow sexual contact. Hope this helps.