YOU SAID:

The reindeer were flying fondly through the sky

INTO JAPANESE

トナカイは気持ちよさそうに空を飛んでいた

BACK INTO ENGLISH

The reindeer was flying happily in the sky.

INTO JAPANESE

トナカイが楽しそうに空を飛んでいた。

BACK INTO ENGLISH

The reindeer were happily flying through the sky.

INTO JAPANESE

トナカイたちは楽しそうに空を飛んでいた。

BACK INTO ENGLISH

The reindeer were happily flying through the sky.