My G[F21]’s [F22]riend caught her Bf[M22] getting off to my Gf’s feet [MFM]

My gf said that her friend caught her bf jacking off to pictures of her feet that he got through her IG stories/posts. My gf said that she was kind of shocked that he would do that. Apparently he’s always been a gentleman around her and never showed signs of that. I guess she just feels weird about it and honestly I don’t blame her. Her friend says that she does not help him out in that regard because she feels uncomfortable with it. My gf said she also felt kinda flattered and it was kinda hot knowing he got hard just from pictures that showed her feet. Whole situation is weird but I guess I wanted some opinions on the matter. What are your thoughts?

Source: reddit.com/r/gonewildstories/comments/s0elck/my_gf21s_f22riend_caught_her_bfm22_getting_off_to