For legal reasons, everyone at the orphanage is at least 18 and unrelated to each other by blood. Britain, for example, criminalizes fictional depiction of minors (there's even been convictions of people possessing manga). They updated the old laws where it was stated the depictions need to be realistic, yet didn't update the one for bestiality. Hence why, pixelated and text bestiality is okay, but anything involving fictional minors is super forbidden. Due to the updates in law and stricter enforcing, some e-libraries have started banning and removing text pornography of many kinds, though, especially ones involving bestiality, rape and incest.