Make my gf cuck me

Im m24, my gf is 21. Ive always been into cuckolding, while she never knew about it really. We have together set up and account for her on one site where she sells pics, ...s, dick rates etc. to make some money. Since then we have talked about it a lot, and being more open about other peoples sex life, sizes and so on. One guy (her client i guess i should call it) told her about him being a bull and that he meets couples, but she ofc didnt connect it to us. When she told me about it, i told her, subtly, that there is something hot about it. Now she often sends me the nicest dicks she receives there or rates, tells me which are her ideals (always much bigger than me) and stuff like that, but when starting the irl cucking convo she always says it sounds hot but would never do it.
Any advice
 
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