First Love, First Crush
noun
Your first love is your first love or your first crush. This usually refers to the first time you fall in love, but it can also refer to the person you fall in love with.
はつこい
Similarly to 初耳, 初 behaves more like a prefix here, which means that this uses kun'yomi readings. You already know these for both 初 and 恋, so you should be good to go!
あなたの初恋ってどんな感じだった？
What was it like the first time you fell in love?
初恋の人の名前は…たしか、ミッちゃんだったかな。
My first love's name was...I think...Micchan.
おじいちゃん、おじいちゃんが初恋をしたのっていつ？
Grandpa, when was the first time you fell in love?