could you be talking about this??
https://www.mangago.me/read-manga/karen_ichijou_tempts_him/
if it is, they also have a sequel:
https://www.mangago.me/read-manga/mitsunaga_ougo_is_trying_to_control_himself/
and then
https://www.mangago.me/read-manga/ougo_karen_wa_amagamisuru/
