http://www.mangago.zone/read-manga/konbini_kun/
http://www.mangago.zone/read-manga/oko_sama_star/
http://www.mangago.zone/read-manga/rutta_to_kodama/
http://www.mangago.zone/read-manga/nirameba_koi/
http://www.mangago.zone/read-manga/hoppe_ni_himawari/
http://www.mangago.zone/read-manga/yamada_to_shounen/
http://www.mangago.zone/read-manga/kokoro_kanda_neko/
i think cute story + nice art is the best for the start
(i thought that you don't want shounen ai O.o xD)
but these are mostly light yaoi
http://www.mangago.zone/read-manga/aitsu_no_daihonmei/
http://www.mangago.zone/read-manga/monster_petite_panic/
http://www.mangago.zone/read-manga/ganbare_nakamura_kun/
http://www.mangago.zone/read-manga/hidamari_ga_kikoeru/
http://www.mangago.zone/read-manga/kanjou_spectrum_yoneda_kou/
http://www.mangago.zone/read-manga/500_nen_no_itonami/
if your friend is into haikyuu check out gusari's doujinshi
Number Call is shounen-ai, and it's awesome.
I'm trying to introduce one of my friends to Yaoi but I don't want to scare her away, but I don't know a lot of shonen Ai: No sex (or sex but not seen in the manga) and, well, something good plz jelp me