When Desire Slips Between Truth & Lies (слэш)

Severus has spent the years after the war rebuilding his life. He worked to open an apothecary, his only saving grace being Harry Potter, who saved him from the clutches of Azkaban and the Weasley twins, who have helped him build a name that isn't tarnished by his Death Eater reputation.
Now contracted with the twins, Severus helps them brew potions for Weasleys' Wizard Wheezes. Little did Severus know there was an added clause in the contract obligating Severus to serve as a test subject on occasion.
What happens when Severus takes a potion that forces him to tell the truth or lies? And what happens when Harry Potter—the man he fell in love with during his trials—is the very person asking him questions he'd rather have never answered?
Watch as both men fall prey to the twins' antics.