Not quite dilf x twink but definitely size gap is there.
https://www.mangago.me/read-manga/first_night_with_my_beloved/
https://www.mangago.me/read-manga/sugar_dog_life/
https://www.mangago.me/read-manga/wait_in_bed_tonight/
https://www.mangago.me/read-manga/risou_no_koibito_himemiya_kun/
https://www.mangago.me/read-manga/a_near_death_experience_is_a_cry_for_love/
https://www.mangago.me/read-manga/ai_o_ataeru_kemonotachi/
https://www.mangago.me/read-manga/koroshi_ya_to_freeter/
https://www.mangago.me/read-manga/hajime_no_koi_nishimoto_rou/
https://www.mangago.me/read-manga/on_or_off/
https://www.mangago.me/read-manga/ikenie_monzenbarai/
https://www.mangago.me/read-manga/kemono_wa_okumade_aisaretai/
https://www.mangago.me/read-manga/kemono_wa_oku_made_nakasaretai/
https://www.mangago.me/read-manga/majo_to_neko/
https://www.mangago.me/read-manga/gochisousama_ga_kikoenai/
https://www.mangago.me/read-manga/i_m_a_lover_large_dog_are_quick/
https://www.mangago.me/read-manga/collar_kiss/
https://www.mangago.me/read-manga/kimi_no_yoru_ni_fureru/
https://www.mangago.me/read-manga/ou_sama_to_puppy_love/
https://www.mangago.me/read-manga/my_dirty_fantasy_came_true/
https://www.mangago.me/read-manga/koko_made_yaru_towa_kiitenai/
https://www.mangago.me/read-manga/kamikudaite_aio_oshiete/
https://www.mangago.me/read-manga/shinnyuu_shain_no_omega_desu_ga_senpai_alpha_kaizoushimasu/
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I hope there's at least one to your liking.
size gap recs pls! BL. like dilf x twink. manga much preferred but manhwa/hua ok too thanks (〜 ̄△ ̄)〜