He kneels behind her while she is on all fours, then she lowers her chest to the bed in this dramatic version of doggy-style.
From The Perfumed Garden:
NINETEENTH MANNER (Coitus of the Sheep) – The woman is on her hands and knees; the man, behind her, lifts her thighs till her vulva is on a level with his member, which he then inserts. In this position she ought to place her head between her arms.
Why you’d want to:
She feels deeply submissive and sexy as she raises her buttocks high in the air and rests her cheek on the bed. He’s excited by the gorgeous view of her body and the way he can penetrate her deeply.
She can try raising and lowering her chest to discover what different angles feel like. If his movements feel too intense, sliding forward on the bed will put her on a shallower angle and make her feel more comfortable.