Seeing June

Lady June Carmarthen is the youngest of her three sisters. April, the eldest, possesses beauty. The middle child, May, possesses wit. And the last, possesses knowledge. When their eldest sister alludes to have fallen in love with a viscount, May and June decide to find out the truth.
Who does their sister love? The duke or the viscount?
And what of June and her secret? Will her secret compromise the mission?

Warning: adult content and language unsuitable for readers under 18.