It was a warm summer evening, and my mother and I were catching the last of the sun on the balcony of my apartment. The balcony was fairly narrow, and our sun beds were angled towards the sun, with me beside and slightly behind my mother, which gave me the opportunity to study her body without her being aware of my scrutiny. She was wearing a new two-piece yellow swimsuit — not exactly a bikini, but surprisingly revealing and very daring for my mother. The top consisted of two half-cups that supported rather than concealed her breasts, and the bottom rode low on her hips, affording me a view of much of her slightly-curved belly, and when seen from behind stretched alluringly over her bottom, barely covering her cheeks, and for a moment I felt my penis stiffen slightly before I remembered it was my mother I was looking at.