I thought it was because manipulating targets with "magic eyes" was Reisen´s shtick and was thereby immune or resistant
The original main point was to be an aphrodisiac, so the love effect was more of an extra....There was one moreWell, you see...carrot pudding left, right?Please don't talk like I already love Tewi~Oh, you don't realize it yourself?You like that girl morethan you think yourself.
The End
I see what you're saying, but it had no effect on me...In the end, it just "creates intense love for the target", so if someone already felt that way, not much would change.