Rather than regular bath products, use dish soap to create longer lasting, denser bubbles. Ask your client to bring along a nude colored strapless push-up bra to achieve some great cleavage.
A step ladder is helpful but also be prepared to stand on counters and toilets to get the shots !
The following sample excerpts from the Boudoir Posing Guide 2 illustrate some great ideas
• Shooting from behind, focus on the lips / shoulder for an artistic, candid shot. Glancing over the shoulder leads to a sexy look and shows off the makeup
• Shoot from a higher angle to emphasize cleavage. Stretching the side and arching the lower back creates a great pose and shows a little more nudity.
Many more posing ideas, tips and tricks are available in the new Boudoir Posing Guide 2