My two cent, if I can.
The story is a little going too far because the dimensions of Bob. Now we are close to the fantasy.
The core of the story, the arousing fact, should be the sharing of Mila thru Bob and the hubbie. IMHO I see that for Dev the most arousing theme is destroying Mila’s holes.
In the first updates the scenario was VERY interesting when Mila acted as Bob’s girlfriend. This (always imo) could be a great story, Mila wife during the day and Mila hot girlfriend by night with Bob, following his kinks.