When I think of weirdest yaoi first on my mind is
http://www.mangago.zone/read-manga/free_dj_can_haruka_have_sex_with_rin_after_suddenly_turning_into_an_odd_little_lifeform/
http://www.mangago.zone/read-manga/onsen_tarzan/
I was reading this yesterday, and I think I lost a few brain cells. I still have yet to complete it, so maybe it gets even weirder.
i have read too many weird things :d i guess enjoy ╮(￣▽￣)╭
http://www.mangago.zone/read-manga/children_can_t_choose_their_parents/
http://www.mangago.zone/read-manga/free_dj_can_haruka_have_sex_with_rin_after_suddenly_turning_into_an_odd_little_lifeform/
http://www.mangago.zone/read-manga/shounen_ebisen/
http://www.mangago.zone/read-manga/tanutan/
http://www.mangago.zone/read-manga/dona_dona/
http://www.mangago.zone/people/tag/122184/detachable+dick/
http://www.mangago.zone/people/tag/122184/seme+is+a+smart+phoneXD/
Meaning things in the same neighborhood as Tomato Pretty (a man picks up a tomato ((??)) at a market who is actually a shouta and the rest, as they say, is history) or like... that one wack yeti one.. ٩(๑❛ᴗ❛๑)۶