好(す)き同士(どうし)lover, boyfriend, girlfriend, soul mate

好(す)き同士(どうし)なら付(つ)き合(あ)うべきだ。

If both are in love, they should date each other. {lover, boyfriend, girlfriend, soul mate}

彼(かれ)らは好(す)き同士(どうし)なのに、結婚(けっこん)しなかった。

Even though they were lovers, they did not get married. {lover, boyfriend, girlfriend, soul mate}

性行為(せいこうい)は、本来(ほんらい)は好(す)き同士(どうし)がすることである。

Sexual intercourse is originally something that lovers do with each other. {lover, boyfriend, girlfriend, soul mate}

好(す)き同士(どうし)か否(いな)かを確認(かくにん)するにはどちらかが告白(こくはく)をせねばならない。

To confirm whether or not they are lovers, one of them has to confess their feelings. {lover, boyfriend, girlfriend, soul mate}

独(ひと)り言(ごと)：「あの憧(あこが)れの先輩(せんぱい)と好(す)き同士(どうし)になれたら、本当(ほんとう)に幸(しあわ)せなのにな〜。」

Monologue: "If I could become mutual lovers with that senior I admire, I would truly be happy~." {lover, boyfriend, girlfriend, soul mate}