Amortentia

More Draco Being a jerk (more details)

Astoria loved Draco, but he felt nothing but friendship for her. He therefore had several misterisses, as the Malfoy men in his family had before him. He only had two, Pansy Parkinson and Millicent Bulstrude. 

Pansy made her way into his bed more often, as he prefered her company more. Either way, he made sure Astoria never knew.