to feel really happy and relaxed without any particular reason

幸せを感じる, リラックスする
to express oneself in a powerful and loud voice

大声で叫ぶ, 響き渡らせる
to relax and take a break especially when feeling stressed or upset

リラックスする, くつろぐ
to overwhelm someone with an excessive amount of tasks or assignments, often beyond their capacity to manage effectively

押し寄せる (おしよせる), 氾濫させる (はんらんさせる)
to have sympathy for someone and hope that they will get through the difficult situation they are in

お見舞い申し上げる, 心を寄せる
to be in a romantic relationship

付き合う, デートする
to kiss and touch someone in a sexual manner

いちゃいちゃする, キスをし合う
to freely express one's deep emotions, thoughts, or feelings

吐露する, 心情を打ち明ける
to express an emotion, typically through honest speech

吐き出す, こぼす
to make someone exhausted through physical or mental activity

疲れさせる, 消耗させる
to relax without doing much activity

だらだらする, のんびりする
to cause someone to feel uncomfortable or surprised by something unusual

戸惑わせる (とまどわせる), 奇妙に思わせる (きみょうにおもわせる)
