This is gross, pedophilic, rapey (and lesbophobic and misogynist but no one cares).
Sex content with child characters is already islamic.
Sex content with child characters for adults is pedophilia.
"Yuri" content with child characters for children (teenagers with an interest in sex) is grooming and also extremely bad advice: dykes should grow up and meet other dykes instead of creeping on and sexually harassing their likely straight friends. Following the tropes of straight romance (where the man and the woman don't need to check each other's orientations) is what makes it so perverted. If you're an underage dyke with a crush on a friend, tell her you're a dyke. She'll say "uh, ok, whatever, you're still my friend tho", or "ew gross", or "me too". If it's the latter, then try dating. Don't creep on her like a male incel.
(And it implies that lust is a sublime upgrade of friendship, not a base and orthogonal biological impulse that the afflicted people have little control over.)