We will each give each other 1 porn girl that the other doesn't know.

Each of us then gets 5-10 photos / her Instagram of the other and is allowed to jerk off on her every day for a week, having sex with her (fucking pocket pussy in different positions etc) and build up a "sexual relationship" with her, so that after the week you can feel that it's your girl.

After the week we compare our size and the smaller one becomes the cuck. The other (bull) is then allowed to control the cuck for the next 7-14 days and takes his girl from him, jerks off to her, shows the cuck her nudes/porns for the first time while the cuck is in chastity etc.

The point is that the cuck will be very jealous after the week because it was his girl the last week and he only sees nudes when she belongs to the bull.