Deontology:
If everyone, as a rule, lewded lolis, the world would be a better place.
you should lewd the loli
Utilitarianism:
lewding the loli brings joy to at bare minimum, yourself, and potentially to many others, all whole harming no one.
you should lewd the loli
Virtue ethics:
a virtuous person would lewd the loli because he/she is a lolicon, and a virtuous lolicon lewds the loli.
you should lewd the loli
Conclusion
you should lewd the loli