Preston Pig gets a letter with 'S.W.A.L.K.' written on the back of the envelope. His mum knows what that means -- Sealed With A Loving Kiss! Preston Pig is back home from his seaside holiday, which we heard all about in the last Preston title, Oomph! One morning Preston is woken by his dad and Postman Pate singing "Preston's got a girlfriend' in the back garden. His mum hands him a letter with his name on and with 'S.W.A.L.K' written across the envelope. It is from Max, the little girl he met at the seaside and she wants to know all about her new friend. So, Preston picks up his pencil and starts writing all about his day!