I think you can't have it both way. Seems like you want her to like it, but not too much. This lifestyle goes much deeper than the cuck having a small cock and the bull a large one. If its enjoyable for her, she'll love the attention, the excitement, the new found confidence, the sexual discovery etc. these are internal emotions that are hard if not impossble to reverse, so there are other bits she may fall in love with that are totally removed from a good bull. Then if you do happen to find a bull who ticks all her boxes in looks, charm, cock size, dominance, charisma she may end up with that school girl crush with him... then your work is really cut out for then to stop her loving the lifestyle. This lifestyle awakens many powerful emotions... good and bad.