Based on the communication which i saw yesterday, with you and OM2, I find it inappropriate for another man to send my W a pic of a banana and to ask her to suck it. I cannot tell you what to do, but i can tell you what I think is wrong.
Personally i would have raised it there and then and in person. I would have been firm but not confrontational. Then i would probably ask her to reply to him that "my husband, finds you messaging my wife highly innappropriate"
Afterall didnt she say she wants to work in the M?
Me31 W31 M11yrs S6yrs 23Mar16-BD 9Apr16-W admitted EA w boss. 27Jun16-W Changed job and promised NC w OM. 14Jul16-Continued contact w OM.Start of Separation. 24May17-Divorced.