he; boyfriend

蛙: frog

換える, 替える, 代える: to exchange, substitute / 変える: to change / 易える: to change

potential form of かう (kau) [godan]

火炎, 火焔: flame, blaze / 花園: flower garden / 佳宴: congratulatory banquet / 窩縁, か縁: cavity margin (e.g. tooth, body)

a book / a script; a scenario / source; origin; root

just

to go; to come to one's place / to (a letter) be delivered / to depart / to rely (on a method) / (年が～) to age / (うまく～) to go well / イく: (slang) to have an orgasm, to come, to cum

past tense and perfective aspect of 行く (iku) [godan]

past tense and perfective aspect of 行う (okonau) [godan]