Design a square 1:1 set of promotional campaign materials for a fictional co-branding collaboration between an adult sexual-wellness brand and a modern Chinese tea beverage shop. Keep the concept tasteful, romantic, warm, and non-explicit. Create a cohesive campaign board showing multiple deliverables: a tea cup design, shopping bag, hand-drawn posters, stickers, small packaging labels, and display signage. Use a gentle Chinese watercolor illustration style with lakeside scenery, spring blossoms, pavilion architecture, soft couple silhouettes, warm cream paper texture, and refined red seal accents. The copywriting should feel poetic and romantic, suggesting heartbeat, warmth, protection, and sharing tea together, without using explicit sexual imagery. Do not copy any real brand names, logos, slogans, package designs, trademarks, or exact visual identity. Use fictional neutral marks only. Keep all materials visually unified, premium, clean, and suitable for a lifestyle marketing presentation. Output aspect ratio: 1:1.