I love Ten and Donna together so much. Not only did they benefit from Tennant and Tate's amazing chemistry together, but I think, from a story standpoint, I think they really had such a wonderful relationship. I think Donna is exactly what the Doctor needed when she came back into his life. I hate how things went down in the end, but I did love their journey together.
As for shipping, much like you, my fanon is that Ten definitely has/d a thing for Donna. I usually think of it as mostly unrequited on Ten's part, though I have admittedly written fanfic where Donna tries things with him just out of curiosity or because she ultimately trusts and cares about him so much. I think they are such a wonderful couple-that-never-was*.
I miss them together, muchly.
* I'm not going to lie, with all the 'we're not together' stuff throughout S4, I had a small hope back then that they might end up in a romantic scenario together at the end of the season, but it was not to be. Oh well. Still, having said that, in most cases I generally prefer my romance-in-Who to be off-screen fanon rather than too big a part of the story arcs.
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As for shipping, much like you, my fanon is that Ten definitely has/d a thing for Donna. I usually think of it as mostly unrequited on Ten's part, though I have admittedly written fanfic where Donna tries things with him just out of curiosity or because she ultimately trusts and cares about him so much. I think they are such a wonderful couple-that-never-was*.
I miss them together, muchly.
* I'm not going to lie, with all the 'we're not together' stuff throughout S4, I had a small hope back then that they might end up in a romantic scenario together at the end of the season, but it was not to be. Oh well. Still, having said that, in most cases I generally prefer my romance-in-Who to be off-screen fanon rather than too big a part of the story arcs.