Well, in my experience, setting out to write something ‘innocent and pure, but touching’ almost bound to lead to something that is contrived and corny.
The best writers write about the stuff they know, stuff they see every day. All the little details that make a book or a story feel real…that’s usually because they are (maybe not precisely the same, but the author will have been inspired by something). It is always difficult to say ‘I’m going to write a story’ and sit down, and write one, without drawing from somewhere.
Why don’t you try reading something - even the newspaper. Think about how the people written about in there feel, how you would feel. What would you do in that situation? What would your friend, or your mum, or your brother do? Understanding why people do things is one of the most important parts of making a story real.
If you want to write about something ‘innocent’, you need to contrast it with something else - a pair of parents bickering say, when a baby comes up with it’s first word. A story without contrast is unlikely to strongly involve a reader.
If you’d like feedback on your writing, I suggest joining www.fictionpress.com - they’re an online community of writers. If you review other stories you’ll get feedback on your own - lots of suggestions and new ideas.